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RegistrationExtensionsOnlyIfTLimit, TActivatorData, TStyle Method

Attaches a predicate to evaluate prior to executing the registration. The predicate will run at registration time, not runtime, to determine whether the registration should execute.

Namespace:  Autofac
Assembly:  Autofac (in Autofac.dll) Version: 6.0.0+39696a967e8826f7f1ebc8c1ff4523c9dd75abe0
Syntax
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public static IRegistrationBuilder<TLimit, TActivatorData, TStyle> OnlyIf<TLimit, TActivatorData, TStyle>(
	this IRegistrationBuilder<TLimit, TActivatorData, TStyle> registration,
	Predicate<IComponentRegistryBuilder> predicate
)

Parameters

registration
Type: Autofac.BuilderIRegistrationBuilderTLimit, TActivatorData, TStyle
The registration to configure.
predicate
Type: SystemPredicateIComponentRegistryBuilder
The predicate to run to determine if the registration should be made.

Type Parameters

TLimit
Registration limit type.
TActivatorData
Activator data type.
TStyle
Registration style.

Return Value

Type: IRegistrationBuilderTLimit, TActivatorData, TStyle
A registration builder allowing further configuration of the component.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IRegistrationBuilderTLimit, TActivatorData, TStyle. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Exceptions
ExceptionCondition
ArgumentNullException Thrown if registration or predicate is .
NotSupportedException Thrown if registration has no reference to the original callback with which it was associated (e.g., it wasn't made with a standard registration method as part of a ContainerBuilder).
See Also